java - Getting Contacts based on the GroupID in Android -

i'm having kind of problem here, since startet developing android. downloaded sample official android website "http://developer.android.com/training/contacts-provider/retrieve-names.html", capable of retrieving showing contacts phone. feature wanted add show contacts group "friends" (hardcoded).

as far narrowed down have change selection part

  final static string selection =             (utils.hashoneycomb() ? contacts.display_name_primary : contacts.display_name) +             "<>''" + " , " + contacts.in_visible_group + "=1"; 

to this

  final static string selection =             contacts.groupid = "friends"; 

which gives me errors, because can't find column.

i'm eager explore potential of android, 1 giving me headache.

there 2 ways getting list of contacts of group. first, suppose have groupid , want related list of contacts.

string[] projection = {             contactscontract.groups._id,             contactscontract.groups.title,             contactscontract.groups.account_name,             contactscontract.groups.account_type     };     return context.getcontentresolver().query(             contactscontract.groups.content_uri, projection, contactscontract.groups._id + "=" + groupid , null, null     ); 

second way: suppose want contacts of specific group constants name. so, it's enough change above codes:

context.getcontentresolver().query(             contactscontract.groups.content_uri, projection, contactscontract.groups.account_name + "='friends'" , null, null     ); 

now have necessary details specific group. can fetch list of contact list:

public static cursor getcontactsofgroup(group group) {     // getting ids of contacts in specific group     string = contactscontract.commondatakinds.groupmembership.group_row_id + "="             + group.id + " , "             + contactscontract.commondatakinds.groupmembership.mimetype + "='"             + contactscontract.commondatakinds.groupmembership.content_item_type + "'";      cursor query = context.getcontentresolver().query(             contactscontract.data.content_uri,             new string[] {                     contactscontract.commondatakinds.groupmembership.contact_id             }, where, null, contactscontract.data.display_name + " collate localized asc");      string ids = "";     (query.movetofirst(); !query.isafterlast(); query.movetonext()) {         ids += "," + query.getstring(0);     }     if (ids.length() > 0) {         ids = ids.substring(1);     }      // getting of information of contacts. fetches of number every 1     string[] projection = new string[]{             "_id",             "contact_id",             "lookup",             "display_name",             "data1",             "photo_id",             "data2", // number type: 1:home, 2:mobile, 3: work, else : other     };     string selection = "mimetype ='" + contactscontract.commondatakinds.phone.content_item_type + "'"             + " , account_name='" + group.accountname + "' , account_type='" + group.accounttype + "'"             + " , contact_id in (" + ids + ")";      return context.getcontentresolver().query(base_uri, projection, selection, null, null); } 

notice, in second fetch in method check accountname , accounttype sure record related group, because may there records stored apps whatsapp. , don't those. ok?

i hope useful you.